Add back sync_integration_tests as a default try job step.
Add back sync_integration_tests as a default try job step.

It's tested by the CQ, so having it as non-defaults forces the CQ to run an
additional run, which is inefficient.

R=nsylvain@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/11146010

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@163923 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build